no
20 years (Bangladesh Patents Act 2022)
no
no
6 months before the filing date/priority date.
Inventions under the via Paris Convention : 12 months from the earliest priority date.
DPDT conducts formality examination and substantive examination of invention patent applications. The substantive examination starts automatically, and the applicant does not need to file a separate request for substantive examination. If the conditions for patent granted are met, the patent application will enter the public stage. If there is no objection within 4 months after publication, the patent application will be authorized.
DPDT only conducts formality examination of design patent applications, not substantive examination.
no
via Paris Convention : 6 months from earliest priority date.
It is protected for 5 years from the date of application, renewed every 5 years, and can be renewed twice, up to a maximum of 15 years.